<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <style>
        .container{
            margin:0 auto;
            width: 100%;
            overflow: hidden;
        }
        .left{
            height: 50px;
            width: 33.33%;
            margin-bottom: -5000px;
            padding-bottom: 5000px;
            float: left;
            background-color: rgba(33, 114, 214, 0.8);
        }
        .main{
            height:100px;
            margin-bottom: -5000px;
            width: 33.33%;
            float: left;
            padding-bottom: 5000px;
            background-color: rgba(255, 82, 0, 0.8);
        }
        .right{
            width: 33.33%;
            float: left;
            margin-bottom: -5000px;
            padding-bottom: 5000px;
            background-color: rgba(90, 243, 151, 0.8)
        }
    </style>
    <title>多列等高</title>
</head>
<body>
    <div class="container">
        <div class="left"> height:50px</div>
        <div class="main">height:100px</div>
        <div class="right">height:30px</div>
    </div>
</body>
</html>